OREGON STATE UNIVERSITY

Glossary beginning with V

Volcano Term Definitions

v
Vent

The opening at the earth's surface through which volcanic materials issue forth.

Vesicle

A small air pocket or cavity formed in volcanic rock during solidification

Viscosity

A measure of resistance to flow in a liquid (water has low viscosity while honey has a higher viscosity.)

Volcanic Arc

A generally curved linear belt of volcanoes above a subduction zone, and the volcanic and plutonic rocks formed there.

Volcanic Complex

A persistent volcanic vent area that has built a complex combination of volcanic landforms.

Volcanic Neck

A massive pillar of rock more resistant to erosion than the lavas and pyroclastic rocks of a volcanic cone.

Volcano

A vent in the surface of the Earth through which magma and associated gases and ash erupt; also, the form or structure (usually conical) that is produced by the ejected material.

Vulcan

Roman god of fire and the forge after whom volcanoes are named.

Vulcanian

A type of eruption consisting of the explosive ejection of incandescent fragments of new viscous lava, usually on the form of blocks.